Flat steel

Everyone has ever seen flat steel. But what flat steel is technically accurate, which standards regulate flat steel, and what flat steel is used for, can be found in detail in this article. In addition, in which steel categories you can classify him.

Definition of flat steel

Technically, flat steel is a steel product made by hot rolling from a larger piece. The shape and thickness decide on the differences in the name.

Differences between sheet metal and flat steel as well as steel strip

Flat steel is technically a so-called "long product" when it is made in rod form. Other long products include:

  • carrier
  • Rails in the technical sense, too
  • Pipes and wires

He belongs technically to profile or steel bars. Sheets are flat steels with a width of more than 300 mm. By contrast, with a thickness which is less than 60 μm, one speaks of a film. On the other hand, strip steel is a flat rolled steel strip and then wound up flat steel. The distinction is quite simple in this case: strip steels look optically "endless" (which of course they are not).

Distinctions are essential because different standards apply to sheet and flat steel. For flat steel, DIN EN 10058 applies. For sheet metal products (technical: flat products), however, DIN EN 10079.

Starting products for the production

The large "ingots", which are used as input material for the production of flat steel, are referred to as slabs in the steelwork industry. From them, flat steel is rolled. This can either happen immediately after the slabs are cast, when the steel is still warm, or even afterwards.

Use of flat steel

Flat steel is an important product above all for further processing. It can either be semifinished product or raw material for the manufacture of other products. Semifinished products are already matched in shape and dimensions to a specific type of production. On the other hand, when used as starting material, flat steels are available in certain standardized sizes.

Flat steel is often used to make small parts by means of machining processes. Often, flat steel is also used as starting material in less developed countries to weld profiles together (in our case, profiles are almost exclusively rolled).

Tips & Tricks

Flat carbon steel is called flat steel with a width exceeding 150 mm, above 300 mm the product is a metal sheet (if it has the correct thickness, up to a maximum of 150 mm). Another important difference between sheet metal and flat steel is that in sheet metal only the thickness is standardized, the length and width may vary depending on the manufacturer. For flat steel (as with all bar steels) you can only change the delivery length, width and height are normalized.

Video Board: How to easily make a small radius bend in flat steel bar